Updated AlfrescoLog class and tests.
Replaced all occurrences of NSLog() and log() with AlfrescoLog.
Merge branch 'master' of https://github.com/Alfresco/alfresco-ios-sdk into topic-log
Updated Samples app to use latest library and added a global "Log Level" setting to the app, accessed via the iOS Settings app.
Merge branch 'master' of https://github.com/Alfresco/alfresco-ios-sdk into topic-log
Set CMISLog to same log level as AlfrescoLog during session creation.
Added latest SDK to samples apps.
Log tests now remember and rest log level between tests.
Reset TEST_AFTER_BUILD setting.
Merge pull request #97 from gavincornwell/master

MOBSDK-459: Provide logging utility